To solve this question we have to make deduct these 2 years. 2100 minus 1958 will give the answer.
You are 142 years old.
(1704 months are passed.)
From 1958 to 2100 there are 142 years. If you want to learn your age in 2100 (born in 1958) your age is 142.
Let's see what will be your age if you born +1 or -1 from that date.